But, he added, it is wise to not only get enough hours of sleep, but to make sure you're sleeping at the «right» times. (health.com)
If you confuse the situation by depriving yourself of enough hours of sleep, or even eating meals at odd hours (times at which your internal clock expects you to be sleeping), you send conflicting signals to your body. (articles.mercola.com)
Getting a good night's sleep is not always a matter of going to bed on time to get enough hours of sleep. (whitenoisemagic.com)