Macbook Pro does not disconnect from wifi while in sleep mode

When I close the lid or manually enter sleep mode, the Macbook keeps connected to the wifi network.

Powernap is off.

Wake up on lan is off.

Latest OS, latest updates.

Reboots.

While most people seem to have the opposite problem with reconnection, this thing simply does not quit the connection unless I switch of the Mbps wifi manually.

My router does not go to sleep mode at night when a device keeps the connection.

Any ideas?