Riding a Sine Wave

Riding a sine wave,
Where the dependent variable
Is your emotions
Is hardly what I call fun. 
It’s a pain,
Constantly going up
And down
And up
And down.
The ups sound fun,
But they aren’t.
To the surprise of many,
You prefer the downs. 
They’re calm.
You get to sleep.
Your feet are still grounded in reality
(For the most part).
But the ups
Are so chaotic
One second experiences ecstasy
The next, terror
One second later, rage.
You get so used to following
This wild function,
That you forget there’s a third option:
Hanging out around the midline.
When do I get to go back
To doing that?