Please choose the correct ending to complete the given sentence: Health: [header] How to fend off fatigue [title] Get some sleep. [step] Not getting enough sleep and regular sleep can make a huge difference. If you have trouble sleeping, try taking melatonin, a substance naturally created by your pineal gland (in the brain.

Ending1: You can find these substances by touching your face in the morning, which helps to tighten the stomach muscles). Sleep aids can also work, as long as it's not the main reason for your fatigue. Ending2: ) it regulates the sleep-wake cycle by chemically causing drowsiness and lowering the body temperature. In patient studies it has helped people restore circadian rhythm, and get back into normal sleep patterns. Ending3: ), which helps to ward off fatigue by blocking hormones and through stimulating hormones through blinking more. This will reduce stress and help you fight fatigue. Ending4: ), which occurs most often in people with pain. If you are in a long run, try to get at least 7 to 9 hours of sleep each night.

Answer format: ending1/ending2/ending3/ending4