circadian rhythm /sɜːˈkeɪdiən ˈrɪðəm/, the natural cycle that tells your body when to sleep and wake up, internal clock /ɪnˈtɜːnəl klɒk/, the system inside your body that controls sleep time, body clock /ˈbɒdi klɒk/, another name for internal clock, natural sleep cycle /ˈnætʃrəl sliːp ˈsaɪkəl/, the normal way people sleep in nature, artificial light /ˌɑːtɪˈfɪʃəl laɪt/, light from lamps, phones, and screens, blue light /bluː laɪt/, light from phones and computers that makes it hard to sleep, sleep deprivation /sliːp ˌdeprɪˈveɪʃən/, not getting enough sleep, sleep debt /sliːp det/, missing sleep over many days, wind down /waɪnd daʊn/, relax before going to sleep, burnout /ˈbɜːnaʊt/, feeling very tired and stressed for a long time, cognitive performance /ˈkɒɡnətɪv pəˈfɔːməns/, how well your brain works, disrupt sleep /dɪsˈrʌpt sliːp/, make sleep worse, boost productivity /buːst ˌprɒdʌkˈtɪvəti/, help you work better, reduce stress /rɪˈdjuːs stres/, make you feel calmer, sleep hygiene /sliːp ˈhaɪdʒiːn/, good habits for sleeping well, natural rhythm /ˈnætʃrəl ˈrɪðəm/, your body’s natural sleep pattern, artificial environment /ˌɑːtɪˈfɪʃəl ɪnˈvaɪrənmənt/, a place with a lot of technology and lights, evolve with light and dark /ɪˈvɒlv wɪð laɪt ænd dɑːk/, change with day and night over time

Sleep B2

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