Fact. Tossing and turning for a half hour or more in bed? It's OK to get up to read or listen to relaxing music. A quiet activity can help you relax and feel sleepy. Staying in bed may lead to frustration and clock-watching. Over time, you may associate your bed with wakefulness, not rest. Serious health conditions have been associated with severe, chronic lack of sleep, including obesity, high blood pressure, diabetes, heart attack, and stroke.