Nightmare Academy Series by Dean Lorey

When Charlie Benjamin sleeps, monsters wake up. It's hard to fit in when your nightmares open portals to the Netherworld, where horrible creatures live--like the class 3 Netherstalker that invaded a sleepover and tried to eat the other children. Luckily there's a place for Charlie--the Nightmare Academy... moreWhen Charlie Benjamin sleeps, monsters wake up. It's hard to fit in when your nightmares open portals to the Netherworld, where horrible creatures live--like the class 3 Netherstalker that invaded a sleepover and tried to eat the other children. Luckily there's a place for Charlie--the Nightmare Academy. Built from wrecked ships set in the branches of the world's most incredible tree fort, the Academy trains people to use their unique gifts to fight the monsters that rush in when the lights go out. But Charlie is far more powerful than anyone ever imagined, and his entrance exam opens a portal straight to the heart of the Netherworld, where ultimate evil plots Earth's destruction. He'll need all his cleverness--and the help of his new friends--to save himself and his family and to put these bad boys to bed once and for all. The monsters under your bed are realBut never fear--the Nightmare Academy will train Nethermancers and Banishers like you to destroy them less

It's the monster hunters' last chance to stop an all-out monster war!We're under attack! The last of the mega-monsters known as the Named are fighting their way into our world, and only a mysterious being known as the Guardian can help—but the Guardian is dying. To save him, Charlie Benjamin and his friends from the Nightmare Academy must journey into the heart of a Hydra cave, through the spooky Bermuda Triangle graveyard, and across the treacherous, monster-filled San Diego Zoo.

Charlie is in big troubleDangeroos, Mimics, Netherstalkers, and worse are everywhere, and the danger to our world has never been greater. The Named have succeeded in summoning the Queen of Nightmares, a villain so terrible that only one person can stop her--Charlie Benjamin, armed with the Sword of Sacrifice... moreCharlie is in big troubleDangeroos, Mimics, Netherstalkers, and worse are everywhere, and the danger to our world has never been greater. The Named have succeeded in summoning the Queen of Nightmares, a villain so terrible that only one person can stop her--Charlie Benjamin, armed with the Sword of Sacrifice. But Charlie can't get the fabled sword without the help of his friends Theodore, Violet, and Brooke--and the sacrifice it demands from them is even more horrifying than a roomful of Ravenous Sticky-Spitters. . . . less