A recent study published in the journal Brain Communications found that reading on a smartphone without a blue-light filter significantly reduced melatonin levels, especially in adults, compared to reading with a blue-light filter or from a printed book. However, while adolescents were able to recover their melatonin levels before bedtime, adults continued to experience reduced melatonin levels. This suggests that avoiding smartphone use in the last hour before bedtime is advisable to prevent sleep disturbances. With the increasing use of smartphones and other devices emitting artificial short…