Getting a good night’s sleep ranks high on the list of things you can do to feel better every day. ___1___ Deep sleep and rapid eye movement (REM) sleep are the two best-known stages. During deep sleep, your body focuses on physical repair and healing. It also gives your brain a chance to consolidate memories. REM sleep helps with memory consolidation as well, and it processes your emotions. Both stages are important for a healthy body and mind.
___2___ The first tip is to keep a consistent sleep schedule. Your body's natural internal clock regulates sleep. Going to bed and waking up at the same time every day helps maintain this clock.
___3___ A cool, dark and quiet room works best for most people. Darkness stimulates the production of melatonin (褪黑激素), a chemical that triggers sleep. A noisy environment can also make sleep difficult, so earplugs may help.
Turn off electronic devices before bed. Many people watch TV to help them fall asleep, but the lights and sounds can wake you up during the night. ___4___ because they are likely to excite your brain when you should be calming down.
Reduce stress and stay active. ___5___ Relaxation methods like meditation and yoga during the day can help. Regular exercise can also improve your sleep and overall health. Follow these tips, and you will be on your way to better sleep.
A. Keep your electronics off and limit screen time before bed.
B. So how do you get enough deep and REM sleep?
C. Make your bedroom suitable for sleep.
D. During sleep, your brain cycles through four stages.
E. Taking a nap during the day can also help you feel more rested.
F. Deep sleep is especially important for children and teenagers.
G. Stress is one of the main causes of poor sleep.
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1.1.
A
B
C
D
解析：选D。D 前文说睡眠对身体很重要，后文直接引出“Deep sleep and REM sleep are the two best-known stages”（深睡和REM是最著名的两个阶段）。选项D“During sleep, your brain cycles through four stages”承上启下——先总说大脑经历四个阶段，再具体聚焦到最著名的两个阶段，逻辑衔接自然。故选D。
