Sleep did not happen to mention that they had a new album coming out on 4/20 called The Sciences. The Internet only found out earlier on 4/19 due to an iTunes Australia listing, which suggested that Sleep would just surprise release the album in its entirety. True to the rumor, The Sciences is out and you can stream it in full below.

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The Sciences is the first Sleep album since 2003's Dopesmoker and is very much worth the wait, if not heavier than expected. The album also contains "Sonic Titan" as a studio track, which has been in the band's live rotation for quite some time and is even featured as a bonus on the Dopesmoker reissue.

No pre-order/order options appear to be available for The Sciences currently. Though we're sure you're at least a little more than pre-occupied with your festivities right now. So go ahead and blast The Sciences at full volume right this second, and who knows – maybe you'll even get a contact high.