Changing dosage

I started on 50mg and it was great, but after about 3 months I upped myself to 100mg because I felt my body get used to it. Went and talked to my doctor who was fine with me upping and gave me a new script for 100. Well, about a month ago I put myself back down to 50mg and I’m loving it. At 100 I had no libido and I was tired a lot. My libido is back and I notice I feel slightly horny 75% at the time. Not enough to disrupt my day, but I notice I can’t go to sleep without getting off and when I do I feel extremely relaxed and drift off quick. Which I guess isn’t a problem, so I guess my question is has anyone experienced this?