I wake up few times through the night. Waken up to seeing things floating tin the air get frightened at these as seem real. Forgetful?

Hypnopompic. There is an actual term for this: hypnopompic hallucinations. Because people usually wake up out of a rem (rapid eye movement) sleep, the brain is still "on" as one's cognitive processes attempt to catch up ("sleep inertia"). The individual may experiece vivid perceptual disturbances, slow reaction time, and/or impaired short-term memory.