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Figueiro, M. G., Wood, B., Plitnick, B., & Rea, M. S. (2013). The impact of watching television on evening melatonin levels: Impact of watching television on evening melatonin. Jnl Soc Info Display, 21(10), 417–421.
Abstract: Self-luminous electronic devices emit optical radiation at short wavelengths, close to the peak sensitivity of melatonin suppression. The present paper investigated if light from a 178-cm (70 in.) television suppressed melatonin. Results showed that light from televisions does not impact melatonin levels in the evening.