Random Riddle: 5-22-2016 - Common Sense Evaluation

I’ve many holes but I will never leak
Not comfortable? Just give me a tweak

Though often together most of the day
Come bedtime we’ll go our separate ways

Life without me might be kind of a drag
‘Cause when I’m not around things tend to sag

Doing my job, your reliable mate
This is a “hold-up” you’ll appreciate

What am I?

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