You could.
I don't. I find it better to focus on using just one. I can always use the next one the next night. Bundling up, doing more, listening more are all messages that you don't trust yourself to get the results you desire. That you're impatient for something to happen.
If you're impatient to see results you're focused on what isn't working and what you focus on you get more of.
That's why I prefer one Paraliminal for sleep learning.
Alex
