How much caffeine does it take to stop you from sleeping?

Caffeine's effects on sleep vary depending on the individual's sensitivity to caffeine, their overall health, and the amount consumed. Generally, it is recommended to avoid consuming caffeine within 4-6 hours before bedtime to ensure optimal sleep quality. The amount of caffeine required to disrupt sleep can range from as low as 100mg (the equivalent of about one cup of coffee) to as much as 400mg (four cups of coffee). However, it is important to note that caffeine's effects can vary significantly between individuals, so it is best to experiment with different amounts to determine what works best for maintaining good sleep hygiene.