Please choose the correct ending to complete the given sentence: Health: [header] How to stay asleep [title] Install blinds and blackout curtains to block out the light. [step] The early morning sun can wake you up before you're ready to get out of bed. Even street lights or the lights from a neighbor's home can disrupt your sleep.

Ending1: Therefore, it's best to create a light-free zone. Blinds will eliminate some light, but adding light-blocking curtains is even better. Ending2: If you have the time, make blinds and blackout curtains for your windows to block out the light as well. [substeps] If you're going to be outside later in the day, consider keeping one full shade over your window to give yourself plenty of sunlight. Ending3: [title] Go to bed when it's dark. [step] The time difference between the hours of night and nighttime hours affects whether you're snoozing or not. Ending4: Installing blackout shades to keep natural light out can help block out even the brightest light sources from your house. [substeps] Opt for lamps that are large enough to help block out light from your home and that are available to you in all kinds of shapes and sizes.

Answer format: ending1/ending2/ending3/ending4