I‘m a lucid dreamer. You are describing the WILD (Wake-Induced Lucid Dreaming) technique. It’s basically entering sleep without losing consciousness by staying focused on some thing (usually your breath but anything works). It’s not an out of body experience. You were dreaming.
Hearing sounds (exploding head syndrome or other sounds), the feeling of spinning, seeing shapes etc. are symptoms of the hypnagogia (transition from wakefulness to sleep) stage. See https://en.m.wikipedia.org/wiki/Hypnagogia
LD is a learnable skill. I can recommend resources if anyone wants.
Hearing sounds (exploding head syndrome or other sounds), the feeling of spinning, seeing shapes etc. are symptoms of the hypnagogia (transition from wakefulness to sleep) stage. See https://en.m.wikipedia.org/wiki/Hypnagogia
LD is a learnable skill. I can recommend resources if anyone wants.