Unwakeable 1.5.1 is available for download. Version 1.5.1 works much better with WordPress 2.6.
The K2 Sidebar manager has been fixed to work with WordPress 2.6 via a plugin. The plugin is a single file named k2-disable-widgets.php and is located in the app/includes folder in Unwakeable 1.5.1. Simply copy that file to the wp-content/plugins folder and activate it as you would any other plugin.
UPDATE: If you’re using WordPress 2.6, you get a chance to preview a theme prior to making it active. The theme preview for Unwakeable 1.5.1 is blank due to the periods in the folder name. Even though the preview appears blank, Unwakeable will still work on your site just fine. If you want to see the preview, just rename the unwakeable-1.5.1 folder to unwakeable151 or simply unwakeable.