Dreams are brilliant aren't they.
That sounds like the classic 'cant escape' dream. I used to get those a fair bit in different ways. Worse one was being attacked by something and finding your arms are stuck to your sides. Yeew, gives me shivers just thinking about it.
Best dream ever, and one that I can only remember having a couple of times, is the flying dream. Actually knowing how to fly. For me it was like Superman and all you had to do was jump off the ground and do the same thing with your legs as you would treading water in a pool. Amazing. I remember waking up actually thinking I could still do it for a couple of minutes. Tempted to go outside and have a go. Best dream ever that.
Dreams hey! Wierd!