Please choose the correct ending to complete the given sentence: Health: [header] How to wake up in the middle of the night [title] Practice by waking up at the same time for a month. [step] Nerves in your brain control your body's clock, known as your circadian rhythm. This rhythm is established by following a predictable routine, which is why you are able to wake up at the same time on the weekend as you are during the week if all factors are equal.

Ending1: So, if your bedtime is eight a.m. and you wake up at 5:00 a.m. Ending2: So the best way to adjust your sleep cycle is to be consistent and make it a routine. [substeps] Take care not to deprive yourself of sleep. Ending3: [substeps] Try sleeping in the evenings after school. This will give you the time to prepare for sleep next weekend. Ending4: [title] Set an alarm in your bedroom or at work. [step] Trying to get up into the morning without your alarm clock can cause the rest of your day to feel boring and sluggish.

Answer format: ending1/ending2/ending3/ending4