Selçuk, a 31-year-old software engineer in Diyarbakır, runs a SaaS side hustle after his day job. The breakthrough wasn't coding harder — it was fixing his bedtime: phone outside the bedroom after 22:00, wake at 06:30 with an Oura Ring sleep score of 88.
The 7pm-10pm Cold Email Window
Selçuk's side hustle cycle fits in a three-hour block. 19:00-20:00 for personalized cold emails to leads that accumulated during the day. 20:00-21:00 for closing existing-customer support tickets. 21:00-22:00 for filing tomorrow's sprint tasks in Linear.
When the 22:00 alarm fires, the MacBook closes and the phone goes to the kitchen. "Did the reply come in?" anxiety used to sabotage sleep — now responses are read at 07:00 the next morning, and customers have adapted to the window.
What Sleep Score 88 Actually Means
An Oura score of 88 corresponds to deep sleep at 18-22% of total sleep and REM at 22-25%. For Selçuk, this translates to the first two hours of the morning (07:00-09:00) producing code with a 40% lower bug rate than evening sessions used to.
- 22:00 bedtime + 06:30 wake = 8.5h time in bed, ~7.4h effective sleep
- No phone in the bedroom: cortisol spikes at 02:00 and 04:30 flattened
- 92% adherence Monday-Friday; weekends drop 5-7 points but tolerated
MRR: ₺3,400 → ₺4,600 in 90 Days
End of February MRR was ₺3,400; mid-May it's ₺4,600. Selçuk's theory is that cold-email quality decays linearly with fatigue. Emails written at 23:30 used to hit 8% reply rate; ones written at 19:30 hit 19%.
Fewer hours, more MRR. "Stamina isn't the asset — decision quality is," Selçuk says. Next quarter's target is ₺7,000, and the phone rule isn't negotiable.
FAQ
What if there's a real customer emergency? Pager duty SMS via a Twilio number is whitelisted as critical; everything else stays silent.
Is the 22:00 rule absolute? Weekdays yes. Friday and Saturday allow drift to 23:30, then strict again Sunday.
Do I need an Oura Ring? No — Apple Watch sleep tracking or Whoop work fine. What matters is measuring and watching the weekly average.
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