This kind of dream shows that you are wasting your energy too much only on one project and that is why you feel tired and not inspired from time to time. If you are working at the laboratory in your waking life, then such dream is a simple reflection of your actual life. If the tests you did with some chemicals in this laboratory have failed, you will fail in your waking life either. If the experiment you did there succeeded you will succeed in your life as well. The laboratory could also indicate the things you find hard to get or you have some problem that is very hard to solve that is why you need the experiments and many tries to make it work. If in the laboratory you work with the stuff that is very expensive, extravagant, you are going to get the life that is going to be more than fine.
Read more about dreaming of Laboratory in other dream meanings interpretations.