We should be sleeping in multiples of 90 minutes - When you sleep, you go through 90-minute sleep cycles., Depressed people are so tired because they dream more - Because dreams can be bizarre, people often assume that they are nonsense., To avoid jet lag remember: fly east, fly early; fly west, fly late. - you want your circadian rhythm to match that of the destination. There are a number of ways to do this. Set your watch to the destination time the moment you get on the plane instead of waiting until you touch down, that way you start to psychologically adapt to the new time straight away., Rewriting the end of recurring bad dreams can change them - Children tend to have recurring nightmares, but these can be stopped, A six-minute nap is better than an hour. - it's actually built into our circadian rhythm that we feel tired around one or two in the afternoon (although modern life rarely allows us to indulge in such a habit)., If you want to get to sleep, try to stay awake - think of an animal for every letter in the alphabet. Another good way of distracting the mind is thinking of very positive scenarios.,

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