Blue light at night is not the full story In almost every study ever made on blue light, we do not have any EMF controls (iPads emit RF radiation) RF radiation exposure BY ITSELF also lowers Melatonin: 👉 Cao et al., 2015 - 1.8 GHz, 2 h/day × 32 days cut daily plasma melatonin by 40% (nocturnal peak), shifted rhythm 👉 Kumar et al., 2011 - 2.45 GHz, 2 h/day × 60 days cut serum melatonin 36% (p<0.003), also testosterone down 👉 Kesari et al., 2012 - 2.45 GHz, 2 h/day × 45 days cut pineal melatonin 34% (p<0.001) and raised brain caspase-3, creatine kinase and Ca²⁺ 👉 Kim et al., 2015 - 915 MHz, 8 h/night reduced urinary melatonin (p=0.003) and 6-OHMS (p=0.026) by suppressing pineal AANAT activity, protein and mRNA 👉 Sallam et al., 2016 - 900 MHz phone signal, 2 h/night × 2 weeks lowered serum melatonin and flattened rhythm; two weeks off exposure did not restore it 👉 Kesari et al., 2011 - 900 MHz exposure lowered pineal melatonin (p<0.05) and raised brain caspase-3, creatine kinase and ROS 👉 Kumar et al., 2013 - 10 GHz, 2 h/day × 45 days lowered melatonin and raised malondialdehyde and creatine kinase 👉 Qin et al., 2012 - 1800 MHz disrupted melatonin rhythm — more than testosterone — strongest effect when exposure fell in the dark phase