Tossing and turning works for salads, not sleep problems. If you can't fall asleep within 15 minutes, the answer is not to keep trying. Don't force yourself to stay in bed, because the wait will be interminable. Instead, get out of bed and do some light activity. Getting your mind off sleep resets and reboots your system. Try a yoga pose, meditation, or a short walk. To get back to sleep, music and meditation seem to work best.