Insomnia at week 5/6

During my first trimester my sleep pattern was messed up. I felt sleepy at 8pm instead of my usual later hours. If I didn't sleep by 8, I'll be wide awake afterwards. Sometimes I would sleep at 8, wakes up at 3am and I have vivid dreams every night. Then feeling sleepy again at 6am. In the end with lack of sleep and nausea, I was forced to quit my job. Ended up I just sleep whenever I am sleepy. Things only start to improve in my 2nd trimester.