I tried WBTB this morning and I couldn't do it for some reason...

I was counting my breaths up to 450 and still nothing happened, I think it's because I kept twitching. About every 5 breaths since around 250 my body (mostly lower back/thighs are) would twitch and there was nothing I could do about it! It controlled itself!

Could that be the problem?

Also, I swallowed every now and then, is that okay? how can I stop it?

After I gave up I went in to normal sleeping position and just let my mind wander. I didn't move my body at all though, and eventually I felt my lower legs (knees and down) getting numb and a bit heavy, slowly crawling up. I was hoping that was SP but then I twitched and it stopped, though I'm not sure if it would have stopped had I not twitched, it was a small twitch anyway. What happened?

Can anyone help me with my WILDS?

thanks