What could be the cause of my insomnia?

See below: Are these new symptoms? Have you had sleep study done? I would suggest talking to your primary care doctor to assess why are you having insomnia. Your next steps should be taken based on whether the cause of your sx has been established. Meanwhile, you can practice relaxation (you can google the script); sleep hygiene, stress management to help you with sleep.

Possible Causes: Possible causes of insomnia include: poor sleep hygiene,Traveling with change in time zones, chronic pain, frequent night-time urination, problems breathing, Shift work, anxiety disorders (esp. PTSD), Depression, bipolar disorder, stress, medications (i.e. stimulants), caffeine, alcohol, eating large amts before bed, aging, restless leg syndrome, sleep apnea, etc.