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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