Say a 15-year old girl on average falls asleep around 3am and wakes up around 7am, over a very long period of time. What short-term and future mental/physical effects can be expected?

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    Welcome Joe. I recommend looking up sleep deprivation in adolescents. It's a very broad topic and I think too broad to answer adequately in SE format.
    – DoctorWhom
    Mar 13, 2018 at 4:44