Sleep Signal presents
Slow Wave.
Less sleep noise.
Popular sleep advice travels fast. Slow Wave keeps it in view, then places it beside the evidence—plainly, cautiously, and without selling you anything.
The whole idea, in one card
Caffeine after lunch is harmless
What people say
“I can drink caffeine in the afternoon and still sleep normally.”
What the evidence says
Grade A · StrongIn a small controlled study, caffeine taken six hours before bed reduced total sleep time and changed sleep measures, even when people did not fully notice the disruption.