Can PHA be used during the day?

I'm curious to know if PHA can indeed be used during the day. I've heard conflicting opinions about its usage, with some suggesting it's best to take it at night due to its potential for drowsiness. However, others claim that it can be taken during the day without any adverse effects. Could you please clarify this for me? I'm particularly interested in understanding the potential impact on my daily routine and productivity if I choose to take PHA during the day. Thank you for your insight.