Normal sleep-wake cycle in a human body is maintained by the secretion of: 
1. Thyroid gland 
2. Thymus gland 
3. Pineal gland 
4. Pituitary gland 

Subtopic:  Pineal Gland |
 94%
From NCERT
NEET - 2022
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Artificial light, extended work-time and reduced sleep-time disrupt the activity of:

1. Thymus gland

2. Pineal gland

3. Adrenal gland

4. Posterior pituitary gland

Subtopic:  Pineal Gland |
 93%
From NCERT
NEET - 2019
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