Is skipping a night of sleep bad for your health? Trying to avoid jet lag.

A little bit. Especially your brain, but also your endocrine system, neurological system, cardio-vascular system, GI system, etc. All need restoration thoough sleep. Of course one missed night of sleep will not result in serious ramifications for your health, but in the big picture, proper sleep on a regular basis is one of the most essential components of all for good health and long life.