Please choose the correct ending to complete the given sentence: Health: [header] How to pretend to be asleep [title] Slow your breathing. [step] Why do you think people look so peaceful while they're sleeping? When you're asleep, your breathing slows down slightly. [substeps] You can practice a breathing exercise to relax and slow down your breath.

Ending1: For instance, count backwards from 100 on your breath to get 1 count from 100. Then, try breathing out slowly from 100 to 150 on each inhale. Ending2: Lie on your back with your head turned slightly to the side so your jaw is about slightly tucked in, or just the left. Then, take a breath in and make a sound such as a " creaking " noise. Ending3: For some people, this exercise works best with short breaths. Others need to inhale a breath slowly. Ending4: Try breathing in through the nose for a count of four, and then out through the nose for a count of four. When you are sleeping, your heart rate also slows.

Answer format: ending1/ending2/ending3/ending4