before going to bed, drink three full glasses of water — not beer or wine, because they suppress R.E.M. sleep — which will force you to get up and go to the bathroom. “Middle-of-the-night awakenings are frequently accompanied by dream recall,” Stickgold says.
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Dark and quiet room. Temperatures in the 60s to low 70s are considered best. Remove or turn off light sources like TVs, VCRs, and alarm clocks, and consider light blocking shades if you live in an urban area or sleep past sunrise. White noise machines or earplugs can be helpful for drowning out bothersome noise.