Some nootropics may have stimulating effects on the central nervous system and can help promote wakefulness and alertness. Examples of stimulating nootropics include caffeine, modafinil, and certain racetams.
However, it's important to note that not all nootropics have a stimulating effect and some may even have a sedative effect, such as melatonin or ashwagandha. Additionally, the effects of nootropics on wakefulness and sleep can vary depending on the individual's sensitivity to the substance and the timing and dosage of administration.
Therefore, it's always best to follow the instructions on the supplement label or consult with a healthcare professional before taking any nootropics to determine whether they may affect your sleep or wakefulness.