Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to fall asleep on christmas eve without any medicine [title] On 23 december, stay up late. [step] Figure on at least two hours past the time you normally go to sleep. [title] On 24 december, wake up around two hours earlier than usual.

Ending1: [step] You'll be tired from staying up late, but resist the temptation to sleep in. That will only make it harder come nighttime! [title] Stay busy all day. Ending2: [step] This will also give you a good night's rest. Don't overdo it though, though, or you will end up with little pieces of memory lost the night before. Ending3: [step] This will help you gradually get used to the darkness. [title] Stay up till dawn the next morning. Ending4: [step] Don't do this at the same time every day or it can interrupt a full night's sleep. Studies have shown that staying up past the one hour mark or one hour is a better night than getting up at either.

Answer format: ending1/ending2/ending3/ending4