Myths vs facts: BDNF and Schlaf

BDNF (Brain-Derived Neurotrophic Factor) is crucial for neuroplasticity and memory. Myth: You can boost BDNF with supplements to fix sleep. Fact: BDNF is primarily upregulated by exercise, cognitive engagement, and adequate sleep itself. Sleep deprivation reduces BDNF levels, while regular physical activity increases them – but oral BDNF supplements are degraded in the gut and do not cross the blood-brain barrier effectively. Another myth: BDNF is a 'sleep hormone'. In reality, BDNF modulates circadian rhythms and synaptic plasticity but is not a direct sleep trigger. Evidence comes from human studies (e.g., sleep restriction lowering serum BDNF) and mechanistic animal work. Caveat: Many commercial BDNF tests or boosters lack robust validation. For sleep improvement, evidence-based strategies like exercise, sleep hygiene, and stress reduction outperform isolated BDNF targeting.