Depends on what you've been taking and in what dosage.
The GABA Z-Drugs such as Zaleplon, Zolpidem and Zopiclone can be taken long-term without much chance for addiction so if it's one of those you'll probably be fine in the long-run. As far as 'withdrawal' goes you might find it more difficult to sleep since your body has been so dependent on medication to get the job done for it.
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