I feel like this phenomena is commen even in people who haven't yet realized their little self is present.
Circumstances get tough or some neural pathway gets triggered, and the mind resorts to it's earliest memories of dealing with said pathways. (I've seen this happen with psychedelic regression in people having trouble coping with reality). It happens even with people in everyday life, raising our voices, stomping our feet, using body language, jumping from excitement; this is all (in my opinion) an expression of our littlest and truest selves. Unhindered and real. It's just about how we react to these impulses is what matters, the joy and laughter and little space can remain!
I think this is a natural mechanism of the mind not to be feared or looked down upon for being present within ourselves, but to be understood...
Perhaps the brain has a 'reset' button for certain things and we are gifted the ability to relive, and relearn how we relate to a situation, and change the neurology (brain wires!) associated with certain things. This can make traumatic experiences less intense and may even change how we view the whole event entirely. (This is what happens during psychedelic therapy!)
I feel that integrating this little side is paramount to all types of vulnerability; creativity of all kinds, opening up to others, opening up to yourself, sharing ideas, being open to new ones, understanding other people and especially children, as well as ingenuity, and newness, along with the flexibility of mind to change and develop genuine enthusiasm for things you love.
There are socially acceptable ways to integrate the inner child within us all, and I feel that guiding and disciplining ourselves to allow that little one to come out and be apart of life ( in a healthy way!! ) is what's most important, rather than "snapping out of it".
I feel like most of us as children were treated similarly, told to go away or to find something to do, when all we wanted was to be apart of things that grownups were doing. I think the same concept applies here, don't shun your little self for wanting to be apart of life! You deserve to be seen!
For me, I don't think I could ever snap out of little space.. my attention is guided towards other areas that actual kids really could not comprehend, but that same child-like enthusiasm remains, perhaps in a way that children may never know until their mind develops some more.
I don't feel that our inner child ever goes away... I just feel that some of us transmute it, box it up, or call it something else to feel like they fit in. I can literally still see the little girl in my mother and grandmother, it's just the age that hides the soul.
If you are looking for ways to snap out of little space, I would suggest finding creative ways to channel that energy in a socially acceptable way.
And make it okay for youself in your mind too!
Who says that littlespace is only at home with certain things or certain people? If you can cultivate a healthy awareness with your little time and little mind, it doesn't matter if you feel little in big places! Just find ways to be healthy and productive about your feelings. Don't let things get out of hand, (just like all emotions!) And be patient with yourself. You deserve to be little whenever you feel as long as you can still do you and your "s'ponsibilities" !!