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For example, a person may be genuinely happy, but once the laughter has started they may be unable to stop or regulate the behaviour, laughing too loud, too much, or for too long.Coping with Emotional LabilityBecome aware of triggersBe aware of triggers for emotional lability and try to avoid these when you can.Triggers can include: excessive fatigue or tiredness
Acquired brain injury can change parts of the brain that regulate or control emotional behaviour and feelings These behaviours can be confusing, embarrassing, and difficult to understand for the person with brain injury and for others around them.
an affect on the brain akin to alcohol in that it takes the edge off of tenseness or nervousness or inhibitions
In this regard, I get the impression that tiredness has an affect on the brain akin to alcohol in that it takes the edge off of tenseness or nervousness or inhibitions (and also think of being "too tired to drive" -- inattentiveness, slow response, mistakes -- similar to alcohol's effects). So, perhaps especially after something that makes you stressful and tired, the tiredness helps you to unwind, and the giggles come more easily.