Please choose the correct ending to complete the given sentence: Health: [header] How to be nocturnal [title] Train yourself gradually. [step] It's difficult to switch straight from a normal sun-driven schedule to one in which you're sleeping while the rest of the world is awake. Doing this will likely just leave you completely sleep deprived, since you'll force yourself to stay up all night and you won't be able to sleep well during the day.

Ending1: [substeps] Spend a day or so crafting your strongest and most essential incentives to stay up all night. This can be anything from watching tv to astronomy. Ending2: Start with setting a sleep schedule for when you'd like to sleep and adjust your bedtime as needed to work towards the same. [substeps] Choose your routine, making it work towards your goal. Ending3: Setting an early bedtime will also help you follow a more specific sleep routine. Do your best to stay in bed for at least one hour every night to get the best quality of sleep possible. Ending4: Instead, gradually start staying up later each night and sleeping in later in the morning. Push the times back more and more, and in a week or so you won't have as much trouble waking and sleeping when you want to.

Answer format: ending1/ending2/ending3/ending4