You know those days where you wake up already exhausted, push through with coffee, and still feel like you're dragging your feet emotionally and physically — even though you're eating well and sleeping enough? Yeah, you're not alone. It might not be burnout or stress. It could actually be a quiet deficiency stealing your spark: vitamin D3.

If you’ve ever tossed and turned at night, staring at the ceiling, you’re not alone. Studies suggest that 10% to 30% of adults experience insomnia at any given time, with even higher rates among older adults and those with disrupted sleep schedules (Bhaskar et al., 2016; Ohayon, 2002). Poor sleep doesn’t just make you feel tired—it’s linked to higher risks of heart disease, obesity, and mental health issues (Sateia, 2014).