A lot of people with ADHD say: "I can not stop doomscrolling first thing in the morning". But let's not forget that circadian dysregulation is a key component of ADHD pathophysiology. In fact individuals with ADHD frequently have mutations or altered expressions of core peripheral clock genes such as BMAL1 and PER2. BMAL1 binds to CLOCK to activate thousands of downstream "clock-controlled genes" that dictate your physical baseline across a 24-hour window whether that's called when your liver processes glucose or when your muscles take up nutrients. A disrupted BMAL1 cycle directly destabilizes your baseline dopamine and reward processing because it directly influences gene expression in the ventral striatum (the brain's primary reward and motivation center). So you will seek out high-stimulation activities simply to feel awake and focused. Now while BMAL1 acts as the accelerator to power up daily systems, PER2 acts as part of the braking mechanism. As the day progresses, PER2 proteins steadily accumulate in your cells. Once they reach peak levels late at night, they physically move into the cell nucleus to bind to and temporarily turn off BMAL1. PER2 also regulates sensorimotor gating (your ability to filter out redundant or irrelevant environmental stimuli), which explains why people with ADHD frequently experience severe sensory overload. This also explains (partly) the irritability component in ADHD. -Morning (BMAL1 deficiency): Irritability from under-arousal. Your engines won't start. -Evening (PER2 dysregulation): Irritability from overstimulation. Your brakes and filters have failed. Now a Zeitgeber is any external, environmental cue that aligns your internal biological clock to the Earth's 24-hour cycle. The primary ones are: -Light Light is the most powerful zeitgeber in existence. When photons hit your eyes, they interact with specialized cells called intrinsically photosensitive retinal ganglion cells (ipRGCs). These cells bypass your visual cortex entirely and travel down the retinohypothalamic tract directly to the master clock in your brain, the suprachiasmatic nucleus (SCN). Getting bright light (ideally 10,000 lux) early in the morning tells the SCN to trigger the rapid breakdown of accumulated PER2 proteins. This acts as a biological "reset button," starting your daily 24-hour clock and signaling BMAL1 to begin increasing morning cortisol and dopamine. -Eating Eating food acts as a massive metabolic time cue. When you eat, insulin and other metabolic hormones spike, which directly upregulates BMAL1 and resets clock-gene expressions in your liver, gut, and fat tissue. So skipping breakfast and having a massive dinner, it's not a great idea if you have ADHD (some people self medicate with fasting + black coffee + nicotine but we've explained why this isn't ideal in previous posts) -Activity Highly intense physical activity late at night raises your core body temperature and spikes cortisol, completely overriding the evening drop in temperature required for PER2 to signal bedtime. -Vitamin D Vitamin D has a regulatory influence on core circadian clock genes, specifically facilitating the balanced oscillation of BMAL1 and PER2 P.S: Supplements/peptides that might help: -NMN + TMG The central molecular clock relies heavily on an enzyme called NAMPT, which fluctuates on a cycle and produces NAD+. When NAD+ levels are high, they activate the enzyme SIRT1. SIRT1 deacetylates the clock repressor PER2, which increases its stability and nuclear transport, while simultaneously boosting BMAL1 binding to DNA -Berberine has been shown to explicitly stimulate the up-regulation and activation of BMAL1. -Resveratrol plays a restorative role, helping to rescue and normalize flatlined or desynchronized amplitudes of CLOCK, BMAL1, and PER2 when they have been blunted by inflammation or high-fat metabolic stress. -Melatonin. Targeted melatonin therapy corrects the attenuated peripheral clock-gene rhythms (BMAL1/PER2) seen in individuals with delayed sleep phases -VIP VIP helps individual neurons expressing BMAL1 and PER2 stay in perfect alignment with one another. Without adequate VIP signaling, peripheral clocks drift apart and desynchronize. -Epitalon/pinealon -NAC When BMAL1 expression is blunted or delayed (as seen in ADHD), the natural morning surge of Nrf2 and glutathione fails to cycle optimally. NAC delivers the raw building blocks to create glutathione, effectively bypassing a lagging BMAL1 switch Anyway, for more read this: fitandball.gumroad.com/l/bra…