Poor Sleep (Chronic Insomnia)

Chronic sleep disruption that impairs metabolism, hormones, immunity, and cognitive function.

Overview

Sleep is not passive rest — it is an active biological process essential for tissue repair, memory consolidation, immune function, hormone regulation, and metabolic health. During deep sleep, growth hormone is released, cortisol is suppressed, the glymphatic system clears brain waste products (including amyloid-beta), and muscle protein synthesis is upregulated. Chronic sleep deprivation (consistently under 7 hours) has been linked to increased risk of obesity, type 2 diabetes, cardiovascular disease, Alzheimer's, and all-cause mortality. Even partial sleep deprivation (6 hours vs 8 hours) significantly impairs insulin sensitivity within days.

Common Symptoms

Difficulty falling asleep (>20 minutes)

Frequent nighttime awakenings

Waking too early and unable to fall back asleep

Unrefreshing sleep despite adequate hours

Daytime fatigue and sleepiness

Difficulty concentrating and brain fog

Irritability and mood disturbance

Increased appetite and cravings (especially carbohydrates)

Weakened immune function (frequent colds)

Reduced exercise performance and recovery

Key Lab Markers

Cortisol (evening/night)

Optimal: Low at bedtime

Elevated evening cortisol prevents sleep onset. A 4-point salivary cortisol test reveals this pattern.

Magnesium RBC

Optimal: 5.0-6.5 mg/dL

Serum magnesium is a poor marker. RBC magnesium reflects intracellular status — deficiency is common and impairs sleep.

Ferritin

Optimal: 40-100 ng/mL

Low ferritin is associated with restless legs syndrome, a common cause of sleep disruption.

TSH

Optimal: 0.5-2.5 mIU/L

Both hyper and hypothyroidism disrupt sleep. Worth screening in chronic insomnia.

Testosterone

Optimal: See low-testosterone page

Low testosterone and poor sleep form a vicious cycle. Poor sleep lowers T, and low T worsens sleep quality.

Common Causes

1.Chronic stress and elevated evening cortisol
2.Blue light exposure in the evening (screens, overhead lighting)
3.Inconsistent sleep schedule (shifted circadian rhythm)
4.Caffeine consumption too late in the day (caffeine half-life is 5-7 hours)
5.Alcohol before bed (disrupts REM and deep sleep despite inducing drowsiness)
6.Sleep apnea (undiagnosed in an estimated 80% of cases)
7.Hormonal changes (low testosterone, perimenopause)
8.Chronic pain or inflammatory conditions
9.Magnesium deficiency
10.Blood sugar instability (nocturnal hypoglycemia causes cortisol spikes)

Evidence-Based Management

1Consistent sleep-wake schedule — same time every day, including weekends (this is the most important single intervention)

2Morning sunlight within 30 minutes of waking — sets circadian clock and cortisol rhythm

3No screens 1 hour before bed, or use blue-light blocking glasses

4Cool bedroom (65-68°F / 18-20°C)

5Magnesium glycinate (300-600mg) before bed — supports GABA activity and muscle relaxation

6No caffeine after noon — even if you "can sleep fine" with evening coffee, it reduces deep sleep quality

7No alcohol within 3 hours of bed — alcohol is the most underrated sleep disruptor

8Evaluate for sleep apnea — if you snore, wake unrefreshed, or have a neck circumference >17 inches

Frequently Asked Questions

How much sleep do I actually need?

The vast majority of adults need 7-9 hours of quality sleep. The small percentage of people who genuinely function well on less than 7 hours carry a rare genetic variant (DEC2/ADRB1). If you use an alarm clock to wake up, you are likely not getting enough sleep.

Is melatonin effective for sleep?

Melatonin is a timing signal, not a sedative. It is most useful for shifting circadian rhythm (jet lag, shift work) rather than chronic insomnia. Low doses (0.3-0.5mg) are more physiologically appropriate than the 5-10mg commonly sold. It does not address the root causes of poor sleep.

Can I catch up on sleep on weekends?

Partial recovery is possible, but social jet lag (shifting your sleep schedule by 2+ hours on weekends) actually worsens circadian disruption. Consistency is more important than total hours. A consistent 7-hour schedule is superior to alternating between 5 and 9 hours.