Please choose the correct ending to complete the given sentence: Health: [header] How to get more rem sleep [title] Understand the stages of sleep. [step] There are four stages of sleep, with the fourth and final stage being rem sleep. In order to get more rem sleep, you need to gradually allow your mind and body to go through the first three stages of sleep.

Ending1: Maintaining a regular sleep schedule and healthy sleep habits will help you do this. [substeps] Stage n1: this is when you are transitioning into sleep and lasts about five minutes. Ending2: When all of the stages are connected, your body will be set up for sleep. These stages will teach you that sleep is the most productive way for your brain, body, and mind to deal with the burden and energy coming from your body, especially during your sleep cycle. Ending3: [substeps] The first stage is sleep deprivation, when you are sluggish, sleepy, and have trouble falling asleep. For some people, this stage is not completely remedied with triperous sleep, which means that after several days you will still be groggy and drowsy. Ending4: You feel calmer, more relaxed, and more alert by the third and final stage of rem sleep. The stages start at 6:35 in the morning and are important during the day.

Answer format: ending1/ending2/ending3/ending4