UPSC PracticeUPSC Practice
UPSC Notes

Sleep and Circadian Rhythms

Articles

1

Momentum

5

Phase IFoundation

Background

Overview

Understanding fundamental biological processes and their disruption by modern lifestyles is vital for public health policy, preventive medicine, and addressing the rising burden of lifestyle-related diseases.

Sleep is a fundamental biological process essential for physical and mental health, regulated by the body's internal clock, known as the circadian rhythm. This rhythm dictates the sleep-wake cycle and influences various physiological processes over a 24-hour period, crucial for brain repair, memory consolidation, and metabolic waste clearance.

Phase IIStatic core

Facts & tables

Key facts

Sleep Functions

Sleep is a critical biological process for brain repair, memory consolidation, and clearing metabolic waste.

Circadian Rhythm

The circadian rhythm is the body's natural 24-hour cycle regulating sleep-wake patterns and other physiological functions.

Melatonin Role

Melatonin, a hormone, plays a key role in regulating the circadian rhythm and inducing sleep.

Disruption Consequences

Disruption of circadian rhythm (e.g., by screen light, chronic stress) impairs brain function and increases health risks.

Reference table

Static syllabus anchors

TypeReference
Conceptual areaHuman Physiology
Conceptual areaPublic Health
Conceptual areaLifestyle Diseases
Phase IIIExam lens

Prelims angle

Overview

Mains (GS2): Health and human development

Mains (GS3): General Science: basic biological processes and their applications

Quick revision

  • Sleep is crucial for brain repair, memory consolidation, and waste clearance.
  • Circadian rhythm is the body's 24-hour internal clock regulating sleep-wake cycles.
  • Melatonin hormone regulates circadian rhythm and sleep induction.
  • Screen time and stress disrupt melatonin production and circadian rhythm.
  • Disruption leads to impaired brain function and increased health risks.

Topic timeline

Human PhysiologyPublic HealthLifestyle Diseases

Quality sleep key to protecting brain health amid rising screen time, say neurologists

22 Jul 2026 · Sleep is vital for brain repair, memory, and waste clearance, governed by the circadian rhythm. This natural 24-hour cycle, regulated by melatonin, is disrupted by factors like screen time and stress, leading to impaired cognitive function and increased risk of neurological disorders.

Read article

Related topics

Current topic

Sleep and Circadian Rhythms

Often confused with

Impact of Digital Technology on Human Health

Open notes

Practice writing on this topic

Write a Mains answer on Sleep and Circadian Rhythms — and get examiner-style feedback on structure and content.

See Mains PYQsEvaluate an answer
Browse all topics