Lately i've been sleeping very restless, and often having nightmares. I normally dont dream at all, let alone have regular nightmares. Mum has always told me that she has nightmares when she sleeps on her back. Since i usually always sleep on my tummy i dont experience that. But i've had a bit of sinus for the last month or so and i cant breathe properly sleeping on my tummy, so i think that since having to sleep on my back and side i've been having these really horrific nightmares. I havent found much on the internet on why people have nightmares when sleeping on their back, but a lot of people seem to be asking the same question . Id really like to know the science of it. If you know why, let me know!