I am not a natural self-experimenter. I do not own a glucose monitor or a cold plunge tank. I have a wearable I mostly use to track sleep, a modest red-light panel bought after reading one too many optimisation threads, and a long-standing scepticism of anything that sounds too good. What I did have, six weeks ago, was enough curiosity — and enough low-grade fatigue — to try something structured.
The plan: introduce one biohacking practice per week, track the same four metrics throughout (HRV on waking, sleep score, subjective energy out of ten, and subjective focus out of ten), and write honestly about what I noticed. No supplements, no peptides — just the practices accessible to most people with modest equipment.
Week One: Red-Light Therapy (10 Minutes Each Morning)
I positioned my red-light panel roughly 30 cm away for ten minutes each morning, targeting chest and face. No goggles initially — I added them after reading about potential retinal sensitivity with prolonged near-infrared exposure.
The subjective change was subtle but present. By day four, I was falling asleep faster — not dramatically, but the lying-awake period shortened. My sleep score did not improve in the first week. HRV was flat. Energy felt marginally improved in the mornings, which I am inclined to attribute to placebo as much as photons. Still, the consistency surprised me; I had expected nothing at all.
Week Two: Cold Exposure (Two Minutes at the End of Each Shower)
I had avoided cold exposure for years on the reasonable grounds that it is unpleasant. The protocol was modest: two minutes of cold at the end of my morning shower, six days a week. The first three days were genuinely difficult. By day five, something shifted — I was no longer dreading it, and the post-shower alertness was unmistakable.
Week two produced the clearest numbers of the whole experiment. HRV on waking rose by an average of 8 ms compared to my baseline. Sleep scores improved slightly. Subjective energy moved up by approximately 1.5 points on average. These are not dramatic figures, but they were consistent, and the HRV change was the most sustained I observed across the entire six weeks.
Week Three: Breathwork (Wim Hof Breathing, Twenty Minutes Each Morning)
I followed the standard Wim Hof guided sessions: three rounds of thirty rapid breaths followed by a breath hold and recovery. The first week was effortful — the light-headedness during hyperventilation phases was distracting, and I twice abandoned the session early. The calming effect that others describe took until roughly day ten to materialise.
By the second week of breathwork, morning anxiety — something I carry as a low-level constant — was noticeably reduced. HRV held steady rather than improving further. Subjective focus improved more than any other metric. The data was harder to disentangle here because I was now running cold exposure and breathwork simultaneously, which is the inevitable limitation of a sequential home experiment.
Weeks Five and Six: Infrared Sauna (Three Sessions Per Week)
I used a local infrared sauna studio rather than a home unit — thirty minutes per session at medium intensity, three times a week. Of everything I tried, this produced the most consistent positive subjective experience. I slept measurably better on sauna days. Muscle tension (a chronic issue for me) reduced noticeably. HRV the morning after a session was consistently higher than on non-sauna days.
Whether the benefit was heat, relaxation, cardiovascular stimulus, or the enforced thirty minutes away from screens is impossible to isolate from a home experiment. I suspect it is some combination. I also suspect it matters less than the fact that it worked.
What I Took From It
Cold exposure produced the clearest objective HRV signal. Infrared sauna was the most consistently restorative. Breathwork had the most delayed payoff but ultimately the most noticeable effect on anxiety and focus. Red-light therapy remains the most uncertain for me personally — the sleep onset improvement was real but the wearable data did not confirm it.
The biggest lesson was methodological: stacking practices in the same window makes it genuinely hard to know what is doing what. If I were to repeat the experiment, I would run longer single-practice phases before combining. The tracking discipline, though, turned out to be the most valuable part — not because the numbers were revelatory, but because having them forced honest assessment rather than motivated reasoning.
