Sleep Cycle
Sleep Cycle is a cycle of approximately 90 minutes consisting of NREM and REM stages, repeating 4-6 times per night. REM duration increases with each cycle, and dreams become more vivid.
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REM Sleep
Rapid Eye Movement — the sleep stage characterized by rapid eye movements. The majority of dreams occur during this phase. The brain is highly active while the body experiences temporary paralysis.
NREM Sleep
Non-REM sleep stages. Consists of three phases: light sleep, medium-depth sleep, and deep sleep. Dreams can occur in these stages but are typically less vivid and shorter.
Dream Recall
The ability to consciously remember dream content after waking. Varies person to person; can be improved through dream journaling, intention setting, and sleep hygiene.
Reality Check
A lucid dreaming technique: regularly asking 'Am I dreaming?' throughout the day to carry this habit into dreams. Tests like counting fingers or reading text are used.
Dream Journal
A notebook or digital record where dreams are recorded immediately upon waking. Increases dream recall capacity, facilitates identifying recurring themes, and is a fundamental exercise for lucid dreaming.
Night Terror / Sleep Terror
A sleep disorder occurring during deep sleep, accompanied by intense fear, screaming, and sometimes sleepwalking. Usually not remembered. Folk traditions describe it as an entity pressing on the chest.