Please choose the correct ending to complete the given sentence: Health: [header] How to get through the day on less than four hours of sleep [title] Do wake up exercises. [step] Get your body moving by doing at least two to three wake up exercises. Go for a short run, walk, jog, or do basic stretching moves.

Ending1: Exercising will raise your core body temperature and release hormones and endorphins in your body, which will boost your energy. [substeps] Do an upper-body fan stretch. Ending2: Your body can heal on it's own by getting it moving when you get tired. It's important to take up at least one hour of sleep per night. Ending3: Wake up before you get out of bed in the mornings before you go to work. [substeps] If you know what time of day your daily routine is, change the schedule to create an alternate wake-up time. Ending4: Aim for this to help lengthen your sleep, especially when you first wake up. If you notice any sluggishness, or lack of coordination, write it down in a notebook so you can remember.

Answer format: ending1/ending2/ending3/ending4