My son is two years old he shakes when he gets up from sleeping is this normal?

Yes, Yes it is. A few seconds of shaking is a common finding.
Yes. Not every child experiences tremors or shaking like this but many do. It occurs in both children and adults, during shifts in the sleep cycle, often as children are falling asleep.Haven't you ever experienced this, kind of like a startle reaction, as you fall asleep or wake up? Do not worry about it.