Here’s a trick I‘ve stumbled over a few years ago: Close your mouth and inhale quietly through your nose to a mental count of four. Hold your breath for a cou

Here’s a trick I‘ve stumbled over a few years ago: Close your mouth and inhale quietly through your nose to a mental count of four. Hold your breath for a count of seven. Exhale completely through your mouth, making a whoosh sound to a count of eight. http://www.medicaldaily.com/life-hack-sleep-4-7-8-breathing-exercise-will-supposedly-put-you-sleep-just-60-332122 http://www.medicaldaily.com/life-hack-sleep-4-7-8-breathing-... For me, it does not work immediately, but it makes me fall asleep much faster. AFAIK this works by calming the sympathetic nervous system, just like meditation would. A downside I‘ve experienced is that sometimes I‘m very cold for a while after waking up.