Drug Free Treatments of Insomnia Stimulus Control Therapy 

I understand its purpose, but I find the "get out of bed after 15-20 minutes" rule can be a stressful situation. It's easy to become too focused on the time restriction in terms creating this "deadline" to fall asleep, which can be quite a stressor. Secondly, it's extremely difficult to judge the passage of time in the sensory deprived situation of lying in bed. A person can again become focused on the time through the desire to precisely follow the guideline. Instead of relaxing & letting go, you start thinking, "has it been 20 minutes?". I am beginning to use some of these CBT techniques to work on my insomnia, what would be your response to my concern? Thanks!