Physical and mental fatigue are different, but they often occur together. Repeated physical exhaustion can lead to mental fatigue over time.
Poor sleep, particularly when it occurs for a long time, can also lead to fatigue. Officials recommend that adults get 7–8 hoursTrusted Source of sleep each night. According to some research, however, around 1 in 3 peopleTrusted Source in the United States say that they do not get enough sleep.
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