We all know the importance of exercise to our health but there is more to it. Just being active during day time will help us a lot. I'm talking about sleeping. I know some of us have problem sleeping at night or what we call "insomnia". Keeping your self physically active during the day could keep you from tossing and turning at night. According to a study presented at the Associated Professional Sleep Societies' annual meeting, 28 women and 8 men suffered from insomnia, assigned to a session of moderate aerobic exercise had a 37 percent increase in their total sleep time. It's not clear how exercise might ease insomnia but elevated levels of stress-relieving brain chemicals such as serotonin and endorphins could play a role, says Lawrence Epstein, M.D. author of The Harvard Medical School Guide to a Good Night's Sleep. Doing simple walking to bicycling, tennis or swimming will help you. Doing more relaxing exercise like yoga might help promote sounder sleep when you do it near bedtime, says Epstein.