Your sleep cycle is based off your usual sleep times, so if you keep awake for a long period of time, your sleep cycle is distroted which means that your cycle is easier to change. Also staying awake for long periods of time doesn't influence how many hours you sleep so the only problem you would have is trying to stay awake, technically sleep isn't as required as we're meant to believe, humans can function normally with only 4 hours of sleep a day, and the absence or presence of natural light can actually alter your body's internal clock and keep you awake longer. Also just to be safe, I did suggest to do it over the weekend (as I've always done), so he isn't doing anything which could be influenced by him staying awake, and I did tell him not to do it more than three times (in a row :S), that's when your body clock would get really messed up and effect your judgement and basic sleep cycles.







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. Nevertheless we were encouraged to follow a fixed sleeping pattern where possible (i.e. while not on exercise and just normal training) so we are prepared for the day ahead which was always going to be rigorous and tough. We would therefore go bed at 11 and wake up at 5AM and this was plenty of sleep, however we were told to maintain this sleeping pattern otherwise it would be difficult to follow on weekdays while "working", although in basic you were working every day. I trust what I was told in army training implicitly, and it worked because we were working extremely hard but still managed to be quite refreshed.



