I take 4mg lorazepam at bedtime for insomnia?

I take 4mg lorazepam at bedtime for insomnia. I forgot my refill and cannot get it until tomorrow. I have a bottle of liquid lorazepam that has been in the fridge, but expiration is 2004. Is it safe to take? I am concerned that is it bad, but really do not know what will happen if I do not get my nightly dose in.

Age: 38
Female
Medications: Levothyroxine 125, lorazepam 4mg po.