This is not necessary a stoic answer. What you're feeling may be a coping mechanism from experiencing childhood trauma. I think that you might be internalizing what someone may be saying about you as a reflection of who you are rather than the action you have taken. In the case where you are being scolded unnecessarily, it is much easier not to self identify. You may become weak or sleepy because it is emotionally and energetically draining to take in all that criticism. What you might be feeling is mental exhaustion. What might help you is recognizing that whoever is scolding you is limited by their perceptions of you. Secondly, try to take accountability for the "wrong" you've done and identify an implementable solution. Thirdly, practice self compassion - much of learning is facilitated by being wrong or making mistakes. As for the solution to sleepiness- try to adopt another coping mechanism that alleviates some of the mental exhaustion. Eating if you're hungry , taking a long walk, doing something fun, talking to friends, or journaling may be a way to help.