Please choose the correct ending to complete the given sentence: Health: [header] How to sleep before an exciting event [title] Cut your caffeine intake. [step] Caffeine can stay in your bloodstream for 4-6 hours. This means that if you drink caffeine within 4-6 hours before bedtime, the caffeine will keep you awake as you're trying to fall asleep.

Ending1: Avoid drinking anything with caffeine at least 6 hours before bedtime. Some studies suggest cutting caffeine out at least twelve hours before you go to sleep. Ending2: Drinking coffee too close to bedtime can make things even worse. Again, using caffeinated beverages can make your cups of tea too hot, but it's best to stick to coffee if you are nearing bedtime. Ending3: If you want to get more sleep, try drinking 5-6 cups of caffeine to help you fall asleep faster and stay awake longer. [substeps] Caffeine can also stimulate the immune system. Ending4: Take extra or over-the-counter caffeine pills to reduce the amount of caffeine in your system. [substeps] When you stop drinking coffee, go for decaf coffee.

Answer format: ending1/ending2/ending3/ending4