Tips to survive 3rd trimester

Hello fellow mums, I'm 31 weeks pregnant and been experiencing insomnia for so many weeks already. Baby is super active all the time, and wakes up to move a lot when I lay down to rest. I feel more easily tired and exhausted. I'm currently on leave, but will resume work in Jan. Quite worried that I can't cope because I will. Have to get up at 5.45am for work and usually end work only at 5-6pm, sometimes 8pm on occasion. Any mothers experienced the same thing and can give me any tips?