Worried About Backsliding

I had never had a good experience sleeping until this past 6 months or so. I started following a simple sleep therapy (not sure what it's called) and I've been falling asleep and waking up much easier than I ever have in my whole life. I still depend on some meds and relaxation techniques like soothing music. I still feel like I beat it a bit.

Now summer's starting and I know my sleep habits are going to shift at least a little. Not teaching at 8 am is already a drastic difference to my body clock which was set to firmly waking up at 7:30 am naturally. It's slowly slipping back to 9 am-ish. I'm going to bed later so it's not like I'm sleeping more, just a bit delayed. Is this natural or a bad sign?

This timing isn't terrible for my schedule right now but I am hoping to stay on a schedule that can at least re-adapt easily during the school year. The biggest worry I have is my returning nightmares. At one point I had nightmare disorder and was terrified to sleep. Every time I have a nightmare I get a little more worried. Lately, I have been having them more and more until this past week it's been every night. So far I don't remember them (which is good; when I remember I can't shake it off). Still, I'm scared and that isn't going to help. Not sure if this is asking for advice so much as sharing my fears...

The bed time shift is quite normal. Anxiety can cause nightmares.

Surprisingly I'm not very anxious in my life right now although I actually tend to get nightmares more when things slow down...

Last night I had another nightmare and I remember more of it which is troubling.

Feel free to share it here.

Thank you! Mostly it's been very fragmented although each night I remember a little more for a little longer. I may be getting myself worked up over nothing too terrible although last night I only slept 6.5 hours which hasn't happened to me in months. Again, it could just be the energy shift.