Lucid dreaming can cause sleep paralysis, in which you remain conscious and aware of your surroundings during the transition from sleep to wakefulness, but are not able to move your muscles. This is harmless, but often terrifying, especially as it can be accompanied by hallucinations of a strange presence in the room. Some muscles are often less affected than others, so concentrate on wiggling your toes or swallowing and stay calm until the hallucinations stop.
О Боже, нет, не надо лучше никаких люцидных снов, как бы круто это ни было -_-