Just click the mouse to pour sand where you want it. Use it to build ramps, slopes and bridges, and to turn the little walkers around. Beware of nightmares; however, they will respond to sand the same as the sleepwalkers do. Also, avoid water since sleepwalkers can't swim.
The game saves your progress as you complete each level. To resume at a later time, click the "load" button on the game's main menu screen. If you get stuck at any point during a game, click "Quit" and restart the level.
From Nitrome, the talented and gifted retro pixel-pushers that created the remarkably enjoyable Hot Air that was reviewed here in December. Sandman was designed by Mat and Jon Annal, with programming by Heather Stancliffe. Very nice indeedy.