Hypnagogic Hallucinations
These hallucinations usually happen at the horizon regarding sleepiness and waking. They usually occur when you're either about to fall asleep or is about to awake. These hallucinations are quite vivid consequently they are not very clear on the person. Although many of people experience such hallucinations a few times in our lifetimes nevertheless if these hallucinations show up frequently, they can certainly target at for being an illness which has to be treated medically.
Some of the common situations which can be seen as the hallucinations usually are falling from height when person suddenly wakes up with a jerk to avoid hitting the garden soil or situations when the owner can actually hear people talking around the dog, the feeling of someone's presence in the room, a feeling of the fact that person is submerged in the water body, etc are common experienced by many most people undergoing the symptoms of hypnagogic hallucinations. However, these hallucinations can be really frightening for many people experiencing them.
Why these hypnagogic hallucinations are generally caused still remains to become topic of debate. It is most normal with people having sleep disorders but additionally, it may take place as an effect of overdose of any sort of medicine. Thus one must see a doctor if she or he experiences such hallucinations.