I had a spot in school I would sit at night when I felt stressed, which was almost every night for a good period of time. I tend to stay back late to study but when it gets dark my mood plummets accordingly, such that I was apprehensive of and dreaded the dark. This safe place I have is at the top of the bleachers (it's a little hard to describe exactly) and there's usually a cool breeze blowing in, though we have a bunch of planes flying above at regular intervals so it isn't that quiet. I like to sit here invisible to passers-by and calm my thoughts. My other (and favourite) safe space used to be in T's office, but that's gone now.

I'm not sure whether you meant a literal or metaphorical safe space so I'll just assume the latter. It's good to have a very powerful and unvitiated memory you can draw on that makes you feel happy and at peace. Thanks for asking this btw because it reminded me of a text my T sent me a while back advising me on the same thing. I don't know if it'll work but it might help to picture yourself in the safe space with a safe someone who acts like an anchor. Also, remember to focus on your breathing!