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Tidur adalah kondisi tidak sadar dimana seseorang hanya dapat dibangunkan oleh stimulasi yg sesuai.
Tidur berfungsi menjaga keseimbangan mental, memulihkan kepekaan sistem saraf, meregenerasi sel2 organ dalam tubuh.
Efek negatif kekurangan tidur:
• Lelah, lesu dan kurang motivasi
• Kurang mood dan lekas marah
• Berkurangnya kreativitas dan kemampuan problem-solving
• Berkurangnya imunitas
• Mudah stress
• Meningkatkan resiko diabetes, penyakit jantung, kerusakan hati dan penyakit kronis lainnya
Fase-fase tidur:
Fase tidur dibagi menjadi NREM dan REM.
- NREM (Non Rapid Eye Movement)
Fase ini terbagi menjadi 4 tahap.
1. Tahap I : berlangsung sekitar 5 menit, dikenal sebagai tahap 'mengantuk' dimana tingkat kesadaran seseorang masih tersisa ½nya.
2. Tahap II : berlangsung 10-30 menit kemudian, frekuensi napas dan nadi menurun. Pergerakan bola mata mulai melambat.
3. Tahap III & IV : denyut nadi, frekuensi napas & proses metabolisme makin melambat, tidur makin dalam hingga sulit dibangunkan
Fase NREM berlangsung sekitar 1 jam, sebelum dilanjutkan ke fase REM. REM (Rapid Eye Movement) Kelanjutan dari fase NREM. Aktivitas otak berlangsung aktif namun otot-otot dilumpuhkan, fase ini disertai dengan mimpi aktif dan sulit untuk dibangunkan.
Kebutuhan tidur tiap orang berbeda, tergantung gender, kondisi fisik, sesuatu yg dikonsumsi dan terutama umur.
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