At end of year 2018, my workload was quite heavy and it affected my sleep. I would wake up whenever I turned in bed, and would not be able to fall asleep after that. I also dreamt a lot every night. Sometimes I try to go to bed early, but no matter what time I go to sleep, I would wake up around 2am, helplessly tossing and turning until dawn. I was exhausted and had to rely on coffee to stay awake at work.