About four in 10 Americans chat or text from bed – a habit that makes it harder to fall asleep. The artificial light from your cellphone can suppress the release of the sleep-promoting hormone melatonin, and doing something active makes you more alert. To fall asleep faster, give yourself time to wind down and keep your bedroom dark and quiet. Getting a good night’s rest can help boost energy and immunity, control your weight and improve you marriage, according to a small, preliminary study. Researchers also discovered that when women don’t sleep well, it triggers tension between spouses. What’s interesting: when men don’t sleep, it appears to make no difference (imagine that!).