Can you tell me what to expect with someone who has experienced sleep paralysis and hallucinations?

Low blood oxygen : These are typical signs of sleep apnea, a condition which involve periods of ten seconds or more without breathing (apnea) and periods of time with shallow breathing and a significant decrease in blood oxygen levels (hypopnia). This condition can be diagnosed by a sleep specialist with either an overnight at home sleep test or at a sleep clinic utilizing a full psg.

Sleep fragmentation: Sleep paralysis ; hypnagogic/hypnopompic hallucinations are due to the intrusion of rem sleep into wakefulness. This occurs due to fragmentation of sleep, that can be attributed to narcolepsy, sleep apnea, as well as other sleep disorders. Treating the underlying disorder can treat them. Having adequate sleep can help. If you're having them often, see a sleep doctor so it can be evaluated.