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PHP support Perl Compatible Regular Expressions (PCRE).
REM Sleep
A sleep stage characterized by rapid eye movements, vivid dreams, and increased brain activity, playing a key role in memory and learning.
Beta Waves
Brainwave patterns associated with active, alert cognition and wakefulness.
Total Sleep Time
The total amount of actual sleep time in a given sleep session, excluding all periods of wakefulness.
Slow-Wave
Referring to the low-frequency, high-amplitude brainwaves that are dominant during the deepest stages of sleep, playing a critical role in restorative sleep processes.
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