Is blue light silently ruining your sleep?
Preview text: The science behind light, melatonin, and your nightly rhythm.
Using this email in an article? Credit: Swanwick Sleep email via They Sent It, with a link to this page. Full-size image
- Subject
- Is blue light silently ruining your sleep?
- Preview text
- The science behind light, melatonin, and your nightly rhythm.
- From
- support@
swanwicksleep.com - Brand
- Swanwick Sleep
- ESP
- Klaviyo
- Sent
- Sat Oct 17, 2026, 6:15 AM ET
- Sent to
- bluelighthack.com
- Size
- 46 KB
- Images
- 18
- Links
- 16, 5 of them buttons
- Subject length
- 42 characters
Against Swanwick Sleep's usual
Sent in the 6 AM hour, which holds 13% of its emails; 21% arrive in the 8 PM hour. The subject is 42 characters; its average is 38.
Email headers
What the brand's servers put on this email. Our receiving servers, the address we subscribed with and unsubscribe links are left out.
- From
- Swanwick Sleep <[email protected]>
- Subject
- Is blue light silently ruining your sleep?
- Date
- Sat, 17 Oct 2026 10:15:45 +0000 (UTC)
- Message-ID domain
- geopod-ismtpd-2
- Return-Path domain
- send.swanwicksleep.com
- DKIM signature
- d=swanwicksleep.com s=s1
- List-Unsubscribe
- Present, one-click
Servers it passed through, newest first
- by recvd-…-fg8lw with SMTP
- from (unnamed) by geopod-ismtpd-2 with HTTP
Other sending headers (names only): X-Kmail-Account, X-Kmail-Flow, X-Kmail-Message, X-Kmail-Ops, X-Report-Abuse, X-SG-EID, X-SG-ID, X-Entity-ID
Sent just before and after
| Oct 18, 2026 6:26 PM | Here's what over 300,000 people noticed after wearing Swannies | |
| Oct 18, 2026 7:00 AM | Here's what over 300,000 people noticed after wearing Swannies | |
| Oct 17, 2026 6:58 AM | Tired all day. Wide awake at night? | |
| Oct 17, 2026 6:15 AM | Is blue light silently ruining your sleep? (this email) | |
| Oct 16, 2026 8:34 PM | Here's what over 300,000 people noticed after wearing Swannies | |
| Oct 16, 2026 6:57 AM | Here’s what your sleep problem is costing you | |
| Oct 15, 2026 8:33 PM | Tired all day. Wide awake at night? |
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Sent the same day by similar brands
Same ESP and the closest weekly volume, sent on Oct 17, 2026.
