Oversleeping disrupts your natural rhythm and leads to grogginess.

过度的睡眠会使你的自然节奏被打乱并导致昏昏沉沉。

So set an alarm, both to avoid the grogginess of a long nap and to make sure you don sleep through anything important.

因此要设定闹钟，这即可避免过长午睡所导致的昏昏沉沉，又不至于午睡过头误了大事。

Disorders like depression can also cause you to feel drained of energy, a symptom that can contribute to your grogginess.

抑郁症之类的小病也会导致你感到浑身乏力，这是会引起你头晕目眩的症状之一。