ja wohl /ya vōlˈ/

Yes indeed

• sleeping berths
• sleeping car
• sleeping carriage
• sleeping carriages
• sleeping cars
• sleeping coach
• sleeping coaches
• sleeping draught
• sleeping draughts
• sleeping partner
• sleeping partners
• sleeping pill
• sleeping pills
• sleeping policeman
• sleeping policemen
• sleepings
• sleeping sickness
• sleeping-suit
• sleeping-suits
• sleep learning
• sleepless
• sleeplessly
• sleeplessness
• sleeplessnesses
• sleep like a log