i keep waking up early hours in the morning with a pain in my back. it feels like a stich or a nerve but only comes on around 4am / 5am in the morning after a nights sleep. it wakes me and I cannot get comfortable or back to sleep. as soon as I am up and about there is no pain and I do not suffer at all during the day or night apart from these times when the pain comes on. this has happened once or twice last week but most morning this week?