Signs You Need the Break

Your body sends clear signals when the 90-minute cycle is ending. You start yawning, even if you slept well. Your mind wanders to unrelated topics. You feel the urge to check your phone or grab a snack.

Israeli sleep researcher Peretz Lavie studied these waking rhythms in detail and showed that alertness rises and falls in cycles rather than staying flat. The practical lesson is straightforward: when those fade signals appear, a short break tends to restore focus faster than forcing your way through.