Instead of dreaming of tomorrow's summit glory, you're lying there imagining an insomnia-induced bonk mid-climb. Wasn't that thicker pad and warmer bag supposed to prevent sleepless nights? Try these strategies from Gary K. Zammit, Ph.D., director of the Sleep Disorders Institute in New York City.
Bring a comfort object Like kids, adults sleep better with familiar things. Try toting your pillowcase (stuff it with clothing) or your usual pajamas.
Stick to your routine A change in habit can disrupt sleep, says Dr. Zammit. Letterman is out, but otherwise do what you typically do before bed--sip tea, brush your teeth, read a book.
Control the environment Block out chirping crickets with earplugs and moonlight with an eye mask.
Stop thinking Anxiety exaggerates the problem. Remedy: Listen to your breathing or count sheep--really, it works.