Does modafinil reduce REM sleep?
https://www.smartfinil.net/product/modalert-200/
Modalert 200 affects sleep architecture, especially REM. Modafinil may increase wakefulness and alertness, however other research show it may impair REM sleep. Some people have less sleep interruption than others. Memory consolidation and emotion control need REM sleep. Monitoring your nightly sleep, especially REM periods, is vital if you use Modalert to remain awake throughout the day. A steady sleep pattern and proper sleep hygiene may reduce disturbances. If you're using Modalert long-term, visit a doctor first.