Insomnia or sleep disturbances can occur due to a variety of causes like pain, anxiety, worry, depression, poor sleep hygiene, certain medications or substances of abuse, medical conditions. Similarly headache can be due to a variety of causes like vision problem, high bp, migraine, tension headache...,, If along with the sleep disturbance, if you have apetite ,mood disturbances as well & other causes of headache are ruled out , then do consult a psychiatrist.