Is Deep Sleep the Only Good Sleep? 3 Truths About Deep Sleep

In the past, we often talked about "sleeping soundly" or "deeply," but with advancements in technology, devices like health bands and smartwatches have made "deep sleep" a buzzword in sleep discussions.

So, what exactly is deep sleep? Is it the only measure of good sleep? Let’s explore the truth about deep sleep and its role in a restful night.

1. Deep Sleep Happens Several Times a Night

On average, adults sleep seven to eight hours, but sleep is divided into cycles, each around 90 minutes long, consisting of light sleep, deep sleep, and REM sleep. In a full night, you'll experience four to five deep sleep phases.

During deep sleep, growth hormones are released, playing a critical role in body repair and memory consolidation, which explains why sleep enhances learning.

2. You Can’t Feel Deep Sleep

Deep sleep can't be felt or measured without specialized equipment like an EEG, which tracks brain activity. So, while smartwatches and fitness bands track movements, they can't accurately detect deep sleep stages.

3. More Deep Sleep Doesn’t Mean Better Sleep

Deep sleep varies per person, usually accounting for 15-25% of total sleep. In an eight-hour night, this amounts to 72-120 minutes. Sleeping longer won't increase deep sleep time, and fitness trackers showing over three hours of deep sleep may be inaccurate.

How to Increase Deep Sleep

To improve deep sleep:
- Exercise Regularly: Physical activity can boost deep sleep.

- Maintain a Healthy Weight: Obesity can lead to sleep issues like sleep apnea, which reduces deep sleep.

- Use Medication Cautiously: While most sleep aids don’t increase deep sleep, certain medications, like olanzapine, may help—under a doctor's supervision.

4 Signs of Good Sleep

Wondering if you’re getting quality sleep? Look for these signs:
- Falling asleep within 30 minutes.
- Waking up briefly, if at all.
- Waking up easily without lingering in bed.
- Feeling energized during the day.

In conclusion, deep sleep is important but is only part of the equation. Focus on overall sleep quality for better rest and energy.