What's something I can take/eat (a drug, etc.) that will prevent from falling asleep for a few hours?!

Botanical Ephedrine or its natural form Ephedra (EPH) is but one of many natural alternatives. This comes with a long list of contraindications and risks so be sure of your preexisting conditions, desire and intent before taking this and any other herbal remedies. Getting physician's approval would also help. That stated here you go:

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These terms are used to refer to the same substance derived from the plant Ephedra. (There are many common names for these evergreen plants, including squaw tea and Mormon tea.) Ephedra is a shrub-like plant that is found in desert regions in central Asia and other parts of the world. The dried greens of the plant are used medicinally. Ephedra is a stimulant containing the herbal form of ephedrine, an FDA-regulated drug found in over-the-counter asthma medications.

In the United States, ephedra and ephedrine are sold in health food stores under a variety of brand names. Ephedrine is widely used for weight loss, as an energy booster, and to enhance athletic performance. These products often contain other stimulants, such as caffeine, which may have synergistic effects and increase the potential for adverse effects. Ephedra is often touted as the "herbal fen-phen."

also:

Ephedrine (EPH) is a sympathomimetic amine commonly used as a stimulant, appetite suppressant, concentration aid, decongestant, and to treat hypotension associated with anaesthesia. Ephedrine is similar in structure to the synthetic derivatives amphetamine and methamphetamine. Chemically, it is an alkaloid derived from various plants in the genus Ephedra (family Ephedraceae). It is most usually marketed in the hydrochloride and sulfate forms.

In traditional Chinese medicines, the herb m

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