are there any breathing techniques i can use to wake myself up when tired?

Yes, there are specific breathing techniques that can help wake you up when you feel tired. Andrew Huberman suggests two main strategies:

1. Super Oxygenation Breathing: This involves inhaling more than exhaling on average during a breathing session. By making your inhales deeper and longer, you can increase alertness. If you breathe very fast following this method, it helps to deploy norepinephrine, which makes you more alert 1.

2. Inhale Deep, Short Exhale: Taking a big deep inhale followed by a shorter, less vigorous exhale is another effective method to increase your level of alertness. This increases your heart rate and can make you feel as if you've had a cup of espresso 2.

Both techniques work by manipulating your body's autonomic arousal, helping shift from a state of tiredness to increased alertness.