You and you alone can be the judge of how much sleep you need. You and you alone can figure out the ways to get that sleep. Listen to your body, become a careful observer of your sleep learn how your sleep reacts.
Surely, it's a good idea to avoid chugging espressos after dinner or choosing to sleep beside the tarmac of a busy airport. But what if you're lying awake, tossing and turning in the quiet of a clean, dark room?