Andrew Huberman supplements with L-theanine for sleep and when feeling under significant stress, particularly in the late afternoon.

“But this is one reason why I supplement theanine for sleep. But if I'm feeling like I've been under a lot of stress and I'm not managing my stress very well with the short-term and medium-term tools that I talked about earlier, I might start taking a little bit of theanine especially in the late afternoon, which is when I tend to start to feel like I haven't gotten enough done and the day is kind of carrying on.”