I think I can correlate my occasional sleep issues with anxiety, late night snacking and TV. I’m getting control of the snacking (Since becoming more mindful of maintaining even blood sugar levels – I don’t seem to have that urge for make-up eating at night after skipping meals during the day… ) and I’ll be turning off my TV earlier as well. My son may have what you refer to as primary insomnia, if I understand that term. He has struggled with sleep off and on since infancy. I’m curious about the possibility of CBT being helpful for him.