Stage 2 is light sleep the brain waves begin to slow with only an occasional burst of rapid activity. Stage 1 represents the transition between wakefulness and a light sleep from which you can easily awaken. A complete cycle averages 90 to 100 minutes with each stage lasting 5 to 15 minutes. Usually, you cycle successively through each of the stages, then begin again. There are, in fact, five: 1, 2, 3, 4 and REM (rapid eye movement). The question, then, becomes, “When are you more likely to suffer sleep inertia and how can you avoid it?” The answer, in turn, requires an understanding of the different sleep stages. Although sleep inertia occurs in fully rested people, its effects are aggravated by sleep deprivation. If you’ve woken to respond to a disaster on deck, the symptoms of sleep inertia can even be life-threatening. You might feel even more tired than when you went to sleep. It typically last only a few minutes, but sometimes much longer, and can be a period of profound confusion, disorientation and impaired performance. This is the gravity well you have to climb out of when woken at the wrong time. There’s also a dark side to naps, called sleep inertia. However, it doesn’t have to occur all at once. Stampi’s research indicates 4.5 to 5.5 hours of sleep out of every 24 is the absolute minimum to avoid accumulating a sleep debt. His clients include Brad Van Liew, Mike Golding, Joe Harris and Dame Ellen MacArthur, the woman who broke the record for the fastest solo circumnavigation of the globe in 2005. Stampi is the wizard of sleep for singlehanded ocean sailors. Claudio Stampi, director of the Chronobiology Research Institute in Newton, Massachusetts. “If you sleep too much, you don’t win,” says Dr. It’s like a law of nature, except it isn’t, certainly not at sea. This helps explain why some people get so testy at sea.Įight hours of sleep every night: every school child has learned the minimum. “We were surprised at how pronounced and how wide the spectrum of schizophrenia-like symptoms was,” says psychologist Dr. A sleep deprivation study conducted by the University of Bonn found that after 24 hours of sleep deprivation in healthy patients, researchers observed numerous symptoms otherwise attributed to psychosis or schizophrenia.
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