There are several things I use: - think of past enjoyable moments (for me it's hiking, I usually don't go very far until I fall to sleep) - box breathing - h

There are several things I use: - think of past enjoyable moments (for me it's hiking, I usually don't go very far until I fall to sleep) - box breathing - hold breath for N sec then release, then N+10, then ... - try to relax your body from top to bottom (forehead, eyes, cheeks, mouth, ...) - imagine your body is very light, like your floating in the air - imagine your body is very heavy, like a block of concrete sinking into your bed - pick TAOCP and try to solve the exercises ;)