Problem with sleeping can cause tiredness.

This can cause nodding when meditating.

Tiredness interferes with concentration and the practice of meditation. This can cause frustration and other feelings to arise.

If you feel tired, you re recommended to stand up and walk around, or splash cold water on your face.

Tiredness contributes to clumsiness, leading to stubbed toes and walking into walls. Especially at 4am.

A bath at 4am can help you to wake up.

Eating too much can also cause tiredness.

It is recommended that you merely eat until you are no longer hungry, and then drink lots of water.