I'll give you a question, please answer with step-by-step reasoning process.
What leads to someone going to to bed?\nOptions:\n- bad dreams\n- lazyness\n- get pregnant\n- sleepiness\n- rest

sleepiness
Sleepiness is the strong desire for sleep and feeling of drowsiness.

People generally go to bed when they have a desire for sleep.

.

Therefore, the answer is sleepiness