Gilla999 I have some thoughts on this. Although I haven’t tried amitryptiline I have noticed this with utrogestan. Last month I forgot to have my 3 day break from it and I felt like I had too much in my system, same thing happens if I eat too close to taking it, and it was hard to get to sleep whereas usually it would help me get to sleep. Also I’ve found the effects of utrogestan are more pronounced when I take magnesium too, so I’ve stopped the magnesium reluctantly. Same thing with lavender, if you use too much it can be stimulating instead of relaxing. What I’m trying to say is, although the dose of amitrypriline might be the same it might be something else has changed and is interacting with it. Hope that makes sense. Also I find sleep deprivation can cause insomnia and anxiety, and hormones, so what you think is causing the insomnia may not be.