[koolhouse]

I was always curious about suttas

talking about the first and second watch of the night, so this video made sense:

 

https://youtu.be/st_Ah6Ykbh4?si=2Yfh2tzuqpc5MA_z

[Lal]

What is the relevance of this post to Buddha’s teachings? 

[koolhouse]

dhamma and science forum:

neurobiology of late night instrospection. And the hypotesis of historical evidence of sleep being spread in portions through the whole night instead of one single long sleep.

 

The suttas seem to show practice in portions of the night, at least ocasionally.

 

Dont you agree?

[Lal]

I asked an AI bot and received the following answer:

What we know from sleep science

Two different ideas need to be separated:

1. Segmented sleep is real, but not required

Historically, many humans slept in two chunks with a calm wake period in between. This wasn’t forced; it emerged naturally in environments without artificial light.

Modern sleep research shows:

• When people live with only natural light, they often drift into a biphasic pattern

• The wake period is usually quiet, low-stimulation, and restful

• People don’t feel sleep-deprived afterward

This suggests segmented sleep is possible, not necessary.

2. Sleep continuity is important for most modern sleepers

For most people today, intentionally breaking sleep:

• Reduces total deep sleep

• Disrupts REM cycles

• Increases daytime sleepiness

• Can worsen mood and cognitive performance

Your brain does a lot of memory consolidation and emotional processing during uninterrupted sleep. Breaking it on purpose usually works against that.

What about waking up to “reflect”?

Here’s the key distinction:

✔️ If you naturally wake up and feel calm

A short period of quiet reflection, journaling, or meditation is usually harmless. This resembles the historical “first sleep / second sleep” pattern.

❌ If you force yourself to wake up

Setting an alarm or deliberately interrupting sleep to think or reflect is generally not a good idea. It fragments sleep architecture and can impair:

• Mood regulation

• Memory consolidation

• Immune function

• Cognitive clarity

Ironically, the very introspection you’re seeking becomes less clear when sleep is disrupted.

Practical guidance

If you’re considering experimenting with segmented sleep, the safest approach is:

• Let it happen naturally, not by design

• Keep the wake period dim, quiet, and low-stimulation

• Avoid screens

• Avoid clocks

• Return to bed when sleepy

If you’re waking up unintentionally and staying awake too long, that’s a different conversation. You may need to seek medical guidance.

[koolhouse]

Thanks Lal, nice AI.

[Author]

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