Note that there are a number of common fixed expressions with prepositions involving everyday time and place nouns where no article is required: after school / at school / before school / from school /in school to school after university / at university / to university in bed / out of bed / to bed at home / from home / go home / leave home after work / at work/ before work / from work / to/into work /leave work from town / in town / out of town/ to/into town after breakfast* at breakfast* before breakfast* for breakfast* to breakfast*
* OR: lunch, tea, dinner, supper by bike/car/bus/taxi/tube/train/plane/boat - BUT on foot More and more people work from home these days at least one or two days per week. I'm going into town this afternoon. Do you want me to get you anything? At school I studied biology, geography and English, but at university I'm going to study psychology. It's quicker on foot or by bike. It will take you ages to get there if you go by car. However, if you are referring to a specified breakfast, bed, school, piece of work etc, the definite article will normally be required: The bed I slept in last night was most uncomfortable. The lunch you prepared this morning was delicious. I'll meet you outside the school at eight thirty. The work that you did on the Tudors was excellent. The car you sold me for £500 is unreliable.