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Another regularly encountered issue is the rather common [[Special:MyLanguage/stage 3/4 loop|stage 3/4 loop]] for beginners. This typically happens when a sleeper cannot complete the adaptation and get stuck in [[Special:MyLanguage/4-Stages Adaptation Model#Stage 4|Stage 4]] where, near the end of adaptation, the sleeper feels inconsistently adapted, excessively tired at certain times of the day, or [[Special:MyLanguage/sleep inertia|sleep inertia]] upon wakes. Because E1 likely has sufficient total sleep to gain all the needed [[wikipedia:Slow-wave_sleep|SWS]], being trapped in Stage 4 may be due to a slight REM deficit. A potential method to address this issue has been proposed, covered in [[Special:MyLanguage/#slightly-modified core length|6.5h core variant]] section.
