In some Episode Huberman mentioned negatieve influence of cbd on sleep. Can you tell me more

CBD’s effect on sleep may depend on dose: lower doses can be wake-promoting, while higher doses may cause sleepiness. The evidence is mixed, and unreliable product labeling makes the actual dose uncertain.

1. Dose and wakefulness: In one discussion, doses around 5–10 mg were described as potentially increasing wakefulness, while doses above roughly 25 mg were associated with more sleepiness or sedation. Another discussion described a possible U-shaped effect, with sleep promotion emerging more clearly around 50 mg and above—so these figures are tentative, not firm dosing guidance. 1 2

2. Possible mechanisms: Proposed explanations for potential sleep benefits include reduced anxiety and, based mainly on animal findings, a drop in core body temperature. A possible effect on adenosine signaling was also raised, but these mechanisms remain tentative. 3 4

3. Placebo and dose context: A cannabis researcher argued that many reported benefits at typical commercial doses could be placebo effects. He contrasted common products, often around 2–25 mg, with much larger doses used in pediatric epilepsy studies, while noting that convincing clinical evidence for sleep benefits is lacking. 5 6

4. Sleep architecture and uncertainty: CBD was described as not showing the same sleep-related detriments as THC, but there is not enough evidence to make a confident judgment about its effects on sleep quality or architecture. Product amounts may also differ from their labels, adding uncertainty about what someone is actually taking. 7 8