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Hypnograms showing the sleep architecture in different groups over a 24-h period in the 7th follow-up month: (A) A sham-operated control (#39). (B) A rat (#34) with TBI but no epilepsy (TBI−). (C) A rat (#36) with TBI and epilepsy (TBI+). Note the fragmented sleep–awake cycle in TBI animals. Abbreviations: N2, N2 sleep stage; N3, N3 sleep stage; REM, rapid eye movement sleep; SFI, sleep fragmentation index; W, awake.
