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The only solution to sleep loss is sleep, so when you’re really struggling napping can be the answer. What type of nap is ‘best’ depends on the situation that you find yourself in. Afternoon naps are easiest during the ‘after-lunch dip’ or ‘siesta window’, which is a natural drop in our circadian rhythm in alertness that occurs in the mid-afternoon – so it is much easier to fall asleep at this time than in the morning, or in the early evenings (when we have peaks in alertness). The exact timings of this dip depend on an individual’s own body clock, but an average time that works across most people is between 1400-1600.