Some Additional Thoughts on How to Sleep Warm in the Winter

The Author.  Picture Taken by the Author

Here are some additional thoughts on how to sleep warm in the winter.  For videos on this subject see my earlier entries to my blog, [Part one HERE] and [Part two HERE], or go to my YouTube channel at BandanaMan Productions, [Part One HERE] and [Part two HERE].

So, how do you sleep warm in the winter?  First, we need to talk about the four ways your body loses heat

Radiation: you lose up to 50% of your body’s total heat production from your head at 39^o F and 75% at 5^o F if it is uncovered

Author’s knit cap and fleece hood.  Picture Taken by the Author

In fall, winter or spring you should always bring a knit cap or a fleece hood just for sleeping in.  I bring a knit cap with me even in the summer, when I am in Algonquin Provincial Park, because that way I can take a lighter sleeping bag and still sleep warm.  The old wives tale about wearing a hat to keep your feet warm is true.

Author’s sweater.  Picture Taken by the Author

Bring a sleeping layer that you can easily put on or take off.  I bring a sweater with me for sleeping, because even during the summer it can be cold at night, sometimes.  Because I brought a sweater as a middle insulating layer for sleeping in, I can bring a lighter sleeping bag and still sleep warm, just as with my knit cap.  I have taken this sweater on many outdoor adventures.  When it isn’t needed, it goes in my stuff sack and becomes a pillow.

Evaporation and respiration: you should always change into dry clothes before sleeping, since you lose body heat as sweaty or wet clothes dry on you.  No matter how careful you are with your layers, your day clothes, particularly your base layers, will be damp from residual sweat.  I always bring a pair of wool socks for just sleeping in, and in the winter, I always bring a base-layer that I wear just for sleeping.

In addition, open the vents in your tent, even if it is freezing, otherwise the moisture in your breath will condense creating frost or dew inside of your tent.  Along the same lines, don’t cover your face with your sleeping bag, the moisture from your breath will condense in it, wetting it and chilling you.

Convection: you lose heat to moving air and the purpose of your tent is to block both precipitation, and wind.  A bivvy bag, just like a tent, when added to your sleeping system, will stop heat loss due to convection.

Conduction, you lose heat to the ground or snow beneath you.  To keep from losing body heat to the ground, you need insulation in the form of trapped air between you and cold ground.  This insulation can be in the form of a bough bed or a sleeping pad.

R-value is a measure of a sleeping pads ability to insulate you from the ground.  The higher the R-value, the higher the insulation it provides.  During the spring, summer and fall, you should use a 3-season sleeping pad, which has an R-value of 2 or higher.  In the winter, you should use a sleeping pad with an R-value of 5 or higher.

R-values are additive, as with clothing layers, you can combine 2 pads to increase your warmth.  In addition, unlike a sleeping bag, using a higher R-value sleeping pad, won’t lead to the sleeper overheating.  Also, since women sleep colder than men, due to an average lower body mass, they will need to increase the recommended R-value by 1: this is true as well for other cold sleepers.

It was in the 20^os the day I camped out and it got even colder that night, dropping down to the mid-teens.  I used two sleeping pads, an inflatable pad and a closed-cell foam pad, and my sleeping bag was a three-piece sleeping bag set.

The NeoAir® All Season™ SV.  Picture Taken by the Author

¾-sized (gray) and full sized (black) closed-cell foam pads. Picture Taken by the Author

The inflatable pad in the picture above is a NeoAir® All Season™ SV, which has 2.5” of loft and an R-value of 4.9.  In the other picture above, I showed both a ¾-sized closed-cell foam pad, which I have used for years, and a full sized foam pad, both of which have an R-value of 1.4.  I had only planned to use one of the foam pads; however, in the end I used them both, with the ¾-sized pad under my head and torso.  By combining the three sleeping pads, I had a total R-value of 7.7 between the ground and me.

The HQ ISSUE Military Style Sleep System, 3 Piece sleeping bag set.  Picture Taken by the Author

The sleeping bag set that I used was the HQ ISSUE Military Style Sleep System, 3 Piece sleeping bag set, which is two nested sleeping bags, inside of a bivvy-bag.  When all three parts are used together, the sleeping bag set is rated for minus 4^o Fahrenheit to minus 22^o Fahrenheit. 

Some other things that you can do to sleep warm in the winter are:

  

·      Make sure that you are warm when you get into your sleeping bag.  Do some jumping jacks or pushups, just enough to warm you up without making you sweat.  If you are cold when you go to bed, you will probably be cold all night long.

·      Shake up your sleeping bag, before you go to bed.  If your sleeping bag has spent the day compressed into its stuff sack, the insulation will need to be fluffed and redistributed, so that there are not col spots.

·      Since your sleeping bag depends on you to warm it up and then keep it up to temperature, use hand warmers or, fill your Nalgene bottle with boiling water and put it into a large sock, and use them to help get your sleeping bag up to temperature.

·      If there is room in your sleeping bag, put your next day’s clothes into the bag with you.  You don’t want to have big pockets of empty space around you, since it is just space that you will have to warm up. 

·      Pull your backpack up over the foot of your sleeping bag.  This will help insulate your feet.

·      Hydrate, hydrate, hydrate.  Your body needs water to keep you warm.  Obviously, if you drink too much you will have to get up and pee, however if you drink to little you won’t be able to maintain your body temperature.

·      If you do have to pee, don’t hold it.  Get up and go or use a pee-bottle, since your body has to spend valuable calories to keep the liquid in your bladder warm.

·      If there are other people in your tent, sleep close together to share body heat.

Before I crawled into my sleeping bag, I did some exercises, ate a high energy, protein and fat rich snack before bed and filled a up a Nalgene bottle with near-boiling water to help me warm up the sleeping bag.  And with the sleeping pads blocking heat loss to the ground by conduction and with my tent and the 3 Piece sleeping bag set blocking heat loss due radiation and convection, I felt that I would be all set for the night. 

So how did it go you might ask?  It dropped to 15^o F by 3:00 am, that night and I slept very warm.  In fact, the biggest problem that I had was that I started to get too warm by 3:00 am and I had to remove some layers to keep from sweating.  The next time that I sleep out in a tent at 15o F, I will do without the bivvy-bag, because the outer sleeping bag’s surface became damp and so, the bivvy-bag was accumulating too much moisture and apparently too much heat.  Interestingly, my Nalgene hot water bottle was still nice and warm at 3:00 am and was a real comfort to curl up with, especially during the early part of the night, when I was still chilled.

Some other cold weather tips:

·      Put your hiking boots or other things that you don’t want to freeze into your sleeping bag stuff sack and push it to the bottom of your sleeping bag.  I learned this lesson the hard way, some-when in the late 70s, when I was sleeping in a tent on a frozen lake.  I left my leather boots in the vestibule of my tent, and the next morning they were frozen solid and I couldn’t put them on until I had thawed them out.  Not a great way to start the morning.  Ever after that, I have put my boots either into my sleeping bag or under my sleeping bag and on top of my foam pad.  Other things that can stop working when they are cold are batteries, cell phones and lighters.

·      Wrap your metal liquid fuel bottles with duct tape, since metal fuel bottles can frost bite your hands in cold weather.  Duct tape will help insulate you from them and it is a good way to store duct tape.

·      Turn your water bottle upside down, in cold weather.  This way if they freeze, they will freeze at the bottom first.

I hope that this helps you to sleep warm in the winter, when you adventure into the outdoors.

Sources:

Clarke Green, “How to Sleep Warm When Camping”, Dec. 20, 2011, https://scoutmastercg.com/how-to-sleep-warm-when-camping/, accessed Nov. 3, 2017

Keith Erps, “What is R-Value?”, Aug. 2, 2018, https://thermarestblog.com/r-value-meaning/, accessed Feb. 4, 2019

William W. Forgey, M.D., The Basic Essentials of Hypothermia, ICS Books, Inc. [Merrillville, Indiana 1991] p 38

“NeoAir® All Season™ SV Review”, https://www.thermarest.com/neoair-all-season-sv#product-info, accessed Feb. 4, 2019

Valerie Loughney Stapleton, “How to Choose Sleeping Pads”, https://www.rei.com/learn/expert-advice/sleeping-pads.html, accessed Feb. 4, 2019

Philip Werner, “Sleeping Pad R Values”, Updated 2019, https://sectionhiker.com/sleeping-pad-r-values/, accessed Feb. 4, 2019

Peggy Wang, “23 Essential Winter Camping Hacks”, http://www.buzzfeed.com/peggy/essential-winter-camping-hacks#39b0zr9, accessed Nov. 3, 2017

How to Sleep Warm in the Winter Part Two

How to Sleep Warm in the Winter Part One

Survival Rations … 1962 Civil Defense Style©

Picture by the Author

 

In October 2018, I posted a copy and wrote a review of Desert Survival: Information For Anyone Traveling In The Desert Southwest 1962 [HERE], and this weekend I decided to make and test, Mr. Lee Kelly’s “Survival Rations” recipe, which, was featured in this pamphlet.

 

 

Desert Survival: Information For Anyone Traveling In The Desert Southwest 1962, p.16

Picture by the Author

 

I found the recipe to be very complete and easy to use.  I listed, below, the modifications or the things that I did, where the original recipe was not clear.

 

When I made this recipe, I used two cups of rolled oats and one cup of Wegmans brand Oats & Honey Flakes.  I substituted a cup of breakfast flakes for one of the cups of rolled oats that the recipe called for, because breakfast cereal is heavily fortified, and I wanted the ration to have a higher nutritional content. 

 

After mixing the cereal and rolled oats, I crushed the flakes by pressing the bottom of the metal mixing cup into the oatmeal and breakfast cereal; I did this to make the ration bar, denser.  After smashing the flakes, I continued to mix in the rest of the dry ingredients, except the gelatin.

 

When I had boiled the water, honey and gelatin and mixed it into the dry ingredients, there were some dregs left in the pot that I had boiled the honey and gelatin in.  So, I added two more tablespoons of water to the pot, swirled it around and then added it to the ingredients, to wet the mix completely.

 

 

Pictures by the Author

 

 

I then mixed and kneaded the dough with my hands, until everything was combined and then I split the dough into two equal pieces and pressed them into the mold.

 

The recipe called for a bar that was two inches wide by five inches tall and one and a half inches thick, which makes a 15 cubic inch bar.  My mold is four inches wide, 5 inches tall and one inch deep, and I packed the dough into the mold until the ration bar was about ¾ inch thick.  By bar when finished it was also a total of 15 cubic inches.  

 

Picture by the Author

 

I dried the bar for two hours, an hour on each side, at 200^o F and when they were done, I had two survival ration bars that weighed one pound each. 

 

Information condensed by the Author

  

I had the bars taste tested by four very through and competent judges, my children, and my youngest son’s 14-year-old friend.  My 14 year old thought that they were “great” and my 19 year old said that they tasted “okay” and that “they were better than hardtack”, which I think means that they are good.  My 23 year old said “these are very good … they have a good texture … they taste kind of like apples” and my youngest son’s friend thought that they were “okay”.  So, that made two polite statements of indifference and two positive reviews.  Personally, I like the way they taste, and I think that they have the flavor of orange blossom honey.  I liked them and I hope that you try them.

 

Picture by the Author

 

Sources:

Civil Defense Joint Council, Desert Survival: Information For Anyone Traveling In The Desert Southwest 1962, (Maricopa County; Phoenix, Arizona [1962]) reprinted in http://docs.azgs.az.gov/SpecColl/1988-01/1988-01-0026.pdf, p. 5-20