To cut to the chase, my mum and dad are separated and I occasionally sleep at my dad's house for the weekend with my brother (I have 3 but one is currently in uni and the other one is too old to go there anymore). I've been suffering with depression for around a year now and I've also be suffering from OCD for nearly 3 years.

The difference between sleeping at my mum's house and sleeping at my dad's house is that at my mum's the landing light is always on at night for my little half brother but at my dad's it isn't.

One night my OCD was stopping from getting too sleep as it was dark and it was constantly playing tricks on me. Aswell as this, my dad got a smart meter which was broken and every 5 minutes or so beeped really loud which scared me everytime. I think the fear from that mixed with the fear caused by my OCD got to me and I started hearing sounds. This was 3 months ago and it still happens at night everytime I go there. The thing is, it's always the same sound. It's like this sort of ambient music which I can't describe but could probably roughly recreate on a piano as it's very simple for anyone interested. It could easily be the neighbours putting on ambient music to go to sleep but the thing is though that I've occasionally heard it in the morning there right after waking up when I'm the only one awake and also when I'm alone at any time of the day and it's quiet, even if I'm not the slightest bit anxious.

Aswell as this, the sound seemingly changes based on my environment. On the first night it happened, I was so scared I went to the kitchen and the sound there was even worse (It was like choppy whistling which started at my bedroom's door and made its way to the kitchen door before stopping which worried me even more). However, there's a few things I've noticed which are:

1. Like I mentioned before, it sometimes happens when I'm not even anxious but it's always at my dad's house, when I'm alone and when it's quiet.
2. I recently started bringing these in-ear wireless earphones to my dad's house and when I have them in I never hear the sound even if I'm not listening to anything in them. However, this doesn't happen with out of ear headphones.
3. Even if for whatever reason I'm scared at my mum's house at night it never happens.

I made this post to get your ideas on if you think this might be caused by anxiety or some other factors. Any help would be appreciated. Thank you in advance.